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Simplifying
7a2 + 9 = 261
Reorder the terms:
9 + 7a2 = 261
Solving
9 + 7a2 = 261
Solving for variable 'a'.
Move all terms containing a to the left, all other terms to the right.
Add '-9' to each side of the equation.
9 + -9 + 7a2 = 261 + -9
Combine like terms: 9 + -9 = 0
0 + 7a2 = 261 + -9
7a2 = 261 + -9
Combine like terms: 261 + -9 = 252
7a2 = 252
Divide each side by '7'.
a2 = 36
Simplifying
a2 = 36
Take the square root of each side:
a = {-6, 6}
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